worried?

This is my second pregnancy, (first was twin). I found out I'm pregnant yesterday and got a positive first response, a negative clear blue then a positive 1-2 weeks digital this morning, I'm 2 days away from af. I've got no symptoms other than my urine smells very sweet, I can't help but this this pregnancy won't work out for some reason :/ anyone else felt this way? I think it's because it's so early